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C. F. DE REDON.

v ELECTRIC BELL. No. 333,614. Patented Jan. 5, 1886.

Inventor.- ztlzesses: cu Q 6 cuj' (Enos/Quiz 3 2 cm a, h a M Q'MALUKO) UNITED STATES PATENT OFFICE.

CONSTANT FRANQOIS DE REDON, OF PARIS. FRANCE, ASSIGNOR TO JEAN FELlX MOREAU, OF SAME PLACE.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 333,614, dated January 5, 1886.

Application filed January 10, 1884. Serial No. 117,085. (No model.\

To all whom it may concern.-

Be it known that I, CONSTANT FRANcoIs DE REDON, a citizen of the French Republic, and a resident of Paris, France, haveinvented certain Improvements in Electric Bells, of which the following is a specification..

My invention relates to electric bells or rheotomes, wherein the contact spring is mounted on the armature, which is fastened on a curved ham mer-springsuch as the one shown in my Patent No. 27 4,573, dated March 27, 1883-and is designed to insure the proper making and breaking of the circuit by the contact-spring.

My improvement consistsinprovidingastop or retractor on the armature,against which the contactspring shall press, and which draws the spring away from the fixed contact in case its own elasticity would otherwise cause it to remain in contact therewith.

In electric bells or rheotomes of this class now in use it often happens that when the electro-magnet attracts the armature the circuitbreaking Spring does not quit its contact, or moves too far, and the action of the spring in this respect varies with the changes of temperature,the extent of variation depending upon the quality of the steel of which the spring is made. It is consequentlynecessary to have recourse to repeated adjustment in order to keep the apparatus always operative. In the accompanying drawings, Figure 1 is a vertical mid-section of a bell of the character shown in my said patent provided with my present invention. Fig. 2 is an elevation of the mechanism with the bell removed. Fig. 3 is an enlarged fragmentary vertical section of the armature and contact-spring. Fig. etis a front elevation thereof, and Fig. 5 is a perspective view of the same.

Referring to Figs. 1 and 2, A is the hammer. O is the electro-magnet. F is its armature, and H is the curved spring, to which are attached the armature F and the hammer A. The construction and connections of this spring are fully described in my said patent No. 274,573. To the armature is attached a light contact-spring, D, the free end of which, when the armature is retracted, touches the end of a contactscrew, a, or other contact-stop mounted on a post, E. The current enters at binding-post B, traverses the coils of the mag net 0, enters the armature, flows through the contact-spring D, and thence out at the bindingpost B, thus exciting the magnet and causing it to attract the armature, and, if the instrument be in correct adjustment, drawing the spring J away from the stop a, and thereby breaking the current after the manner of all rheotomes.

My invention consists, in the addition to the bell thus far described, of a retractor or recallpiece, 6, which is a rigid arm of metal fixed to the armature, its upper end coming into close proximity to the stop a and spring D, but not touching either. \Vhilethe armature is being attracted by the magnet, the spring D will, during the first portion of the movement, remain in contact with the stop a; but before the completion of the movement the spring must leave the stop, and if its own elasticity does not cause it to do so the end of the-retractor 6 will strike it and pull it away. This is accomplished by so adjusting or constructing the retractor relatively to the contact-stop a that when the armature is retracted (or remote from the magnet) the end of the screw or stopa projects farther than the end of the retractor 6; but when the armature is attracted the end of the retractor projects beyond the stop. This adjustment is made once for all, and no subsequent variation of the spring D can impair it or render the bell inoperative. It is thus that I avoid the necessity for frequent readjustment of the instrument. The retractor e is made as part of a plate, I, which is attached to the armature F by screws f f, thus clamping the spring H between the armature and plate. The plate I is cut out to admit the spring d, which is formed asa tongue cutfrom the spring H. The plate I is curved to conform to the proper curvature of the spring H, and serves as a re-enforcement of the latter at this point, holding it in shape.

I claim as my invention-- 1. The combination, to form a rheotomio electric bell, of an electro magnet, a curved.

spring, the armature, hammer, and contactspring fixed to said curved spring, the contact-stop, and a retraotor carried by the armature and adapted on the attraction of the ar- D and to form a retractor, e, substantially as 10 mature to withdraw said contact-spring from set forth. said stop, substantially as set forth. In witness whereof I have hereunto signed 2. The combination of the electromagnet G, my name in the presence of two subscribing 5 the spring H, the hammer A, and armature F, Witnesses.

fastened to said spring, the contact-stop a, and CONSTANT FRANQOIS DE REDOX. contact-spring D, and the re-enf0rce plate I, \Vitnesses:

fastened to the armature against the outer side ROBT. M. HOOPER,

of the spring H, and slotted to ad mit The spring AMAND BITTER. 

